Negative coverage: borrow_check_expr / assign-op / premise access_permitted(env, assumptions, state, Access::new(AccessKind::Write, place), places_live_on_exit) => state
Premise at line 447. Observed failure causes: failed_judgment.
assign-op| Line | Coverage | Source |
|---|---|---|
| 432 | 1 | (borrow_check_expr( env, assumptions, state, rhs, Seq(place, Assignment(place)).live_before(env, &state, places_live_on_exit), ) => (rhs_ty, state)) |
| 439 | N/A | (let places_live_before_write = Assignment(place).live_before(env, &state, places_live_on_exit)) |
| 441 | ✗ | (borrow_check_place_expr(env, assumptions, state, place) => (place, state)) |
| 442 | ✗ | (prove_ty_is_rigid(env, assumptions, state, &place.ty) => (RigidTy { name: RigidName::ScalarId(scalar), parameters: _ }, state)) |
| 443 | 1 | (if scalar.is_int()) |
| 444 | 1 | (prove_assignable(env, assumptions, state, rhs_ty, &place.ty) => state) |
| 446 | 2 | (access_permitted(env, assumptions, state, Access::new(AccessKind::Read, place), places_live_before_write) => state) |
| 447 | 1 | (access_permitted(env, assumptions, state, Access::new(AccessKind::Write, place), places_live_on_exit) => state) |
| 448 | N/A | (let state = kill_loans(place, state)) |
| ──────── ("assign-op") | ||
| 450 | 7 | (borrow_check_expr(env, assumptions, state, Expr::AssignOp { place, op: _, rhs }, places_live_on_exit) => (Ty::unit(), state)) |
1 test failed proving this premise:
Source location: tests/borrowck.rs:5052 (all coverage from this test)
fn foo() -> () {
let x: u32 = 1_u32;
exists<'r0> {
let r: &'r0 u32 = &'r0 x;
x += 1_u32;
let y: u32 = *r;
}
}Failed proof tree
check_all_crates failedmod.rs:42args
rule "check all prefixes"mod.rs:54check_crate failedmod.rs:61args
rule "check crate"mod.rs:74check_crate_item failedmod.rs:179rule "free fn"mod.rs:207check_free_fn failedfns.rs:14args
rule "check free fn"fns.rs:24check_fn failedfns.rs:31args
rule "check fn"fns.rs:54check_fn_body failedfns.rs:61args
rule "expr fn body"fns.rs:89borrow_check failednll.rs:124args
rule "borrow_check"nll.rs:135borrow_check_block failednll.rs:142rule "basic block"nll.rs:157borrow_check_statement failednll.rs:174args
rule "exists"nll.rs:302borrow_check_block failednll.rs:142args
rule "basic block"nll.rs:157borrow_check_statement failednll.rs:174args
rule "expr"nll.rs:232borrow_check_expr failednll.rs:371args
rule "assign-op"nll.rs:447access_permitted failednll.rs:862args
rule "access_permitted"nll.rs:878access_permitted_by_loans failednll.rs:885rule "access_permitted_by_loans"nll.rs:898access_permitted_by_loan failednll.rs:905args
rule "borrow of disjoint places"nll.rs:920 (failed: if_false)rule "loan is dead"nll.rs:967loan_not_required_by_live_places failednll.rs:1296args
rule "loan_not_required_by_live_places"nll.rs:1321loan_not_required_by_live_place failednll.rs:1328args
rule "loan is not required by type"nll.rs:1348loan_not_required_by_parameter failednll.rs:1396args
rule "alias-ty RFC 1214"nll.rs:1432loan_not_required_by_parameters failednll.rs:1533args
rule "loan_not_required_by_parameters"nll.rs:1554loan_not_required_by_parameter failednll.rs:1396args
rule "rigid-ty"nll.rs:1416loan_not_required_by_parameters failednll.rs:1533args
rule "loan_not_required_by_parameters"nll.rs:1554loan_not_required_by_parameter failednll.rs:1396args
rule "lifetime"nll.rs:1506loan_cannot_outlive failednll.rs:1513args
rule "loan_cannot_outlive"nll.rs:1526 (failed: if_false)
rule "write-indirect"nll.rs:947 (failed: if_let)